<template>
  <div class="my-tab-bar">
    <div class="tab-item" v-for="(item,index) in list" 
    :key="index" 
    :class="{ current: index === activeIndex }" 
    @click="clickFn(index,item.componentName)">
      <!-- 图标 -->
      <span class="iconfont" :class="item.iconText"></span>
      <!-- 文字 -->
      <span>{{ item.text }}</span>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 点的的所以index是循环的索引
      activeIndex:0
    }
  },
  props: {
    // 判断传过来的数据类型
    list: {
      type: Array,
      required: true,
      validator(val) {
        if (val.length < 2 || val.length > 5) {
          console.error('prop list must between 2 and 5 characters')
          return false
        }
        return true
      }
    }
  },
  methods: {
    // componentName接收clickFn传入的组件名称
    clickFn(index,componentName) {
      // 把循环的index赋值给点击的变量activeIndex
      this.actibeIndex = index
      this.$emit('changeCom',componentName)
    }
  }
}
</script>

<style lang="less" scoped>
.my-tab-bar {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: white;

  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}

.current {
  color: #1d7bff;
}
</style>